References

RRÅ, V.kh., 1, 62.2
  bhastrikā daṃśakān ekā śilā khalvo'pyudūkhalam //Context
RRÅ, V.kh., 10, 18.1
  sarveṣāṃ pratibhāgaikaṃ śilāmadhye vinikṣipet /Context